The DL-300-WF series is an IAQ(Indoor Air Quality) monitoring module with Wi-Fi, Ethernet and RS-485 interfaces. It provides a WLAN connection which complies with the IEEE802.11b/g/n standards. With the popularity of 802.11 network infrastructure, the modules make an easy way to incorporate wireless connectivity into monitoring and control systems. The DL-300-WF series of data logger devices can be used to record CO, CO2, temperature, humidity and dew point information, including date and time stamps, and are able to store up to 450,000 downloadable records.

Real-time data can be accessed from the DL-300-WF data logger from anywhere and at any time using the free Windows software, the iOS App or the Android App, as long as they are connected to the same local network as the data logger. Support is provided for popular industrial protocols such as DCON, Modbus RTU, and Modbus TCP, as well as the emerging machine-to-machine (M2M)/)IoT (Internet of Things) connectivity protocol – MQTT. The DL-300-WF Data Logger can be connected via widely used communication interfaces including RS-485, Ethernet and PoE, meaning that the device can be easily integrated into existing HMI or SCADA systems, and is easy to be maintained in a distributed control system.


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    • Simultaneous Display for CO, CO2, Temperature, Humidity and Dew Point
    • Non-dispersive Infrared (NDIR) CO2 Sensor
    • 2.8″ LCD Touch Screen
    • Able to store up to 450,000 records with date and time stamps
    • Touch-screen and Web-based Configuration Interface
    • Simple and Powerful Software Utility, iOS APP and Android App Included
    • Able to Display Multilingual Messages on the Screen
    • Supports the DCON, Modbus RTU, Modbus TCP and MQTT Protocols
    • Includes RS-485/Ethernet/Wi-Fi Communication Interfaces
    • Compatible with IEEE802.11b/g/n standards
    • Support infrastructure and limit-AP modes for wireless networks
    • Relay Output for Audible/Visual Alarm or IAQ Device Control
    • Includes redundant power inputs: PoE (IEEE 802.3af, Class 1) and DC input
    • Desktop, DIN-Rail or Wall Mounting
    • Transportation of Food or Pharmaceuticals
    • Food and Beverage Industry (HACCP)
    • Blood Stations and Pharmacies
    • Building and Energy Management
    • Warehouse Management
    • Museums, Archives and Galleries


    Models DL-301-WF DL-302-WF DL-303-WF DL-307-WF
    HCHO Measurement
    Range 0 ppb to 2000 ppb (Electrochemical)
    Resolution 1 ppb
    Accuracy 0 ~ 300ppb : ±30ppb
    > 300ppb : ±10%
    Response Time ≤60 seconds
    Warm-up Time 180 seconds
    TVOC Measurement
    Range 0 ppb to 60000 ppb
    (MEMS Metal Oxide)
    Resolution 1 ppb
    Accuracy ±15%
    Response Time 60 seconds
    Warm-up Time 180 seconds
    CO Measurement
    Range 0 to 1000 ppm (Electrochemical) 0 to 1000 ppm (Electrochemical)
    Resolution 1 ppm 1 ppm
    Accuracy ±5% of measured value ±5% of measured value
    Response Time 30 seconds 30 seconds
    Warm-up Time 300 seconds 300 seconds
    CO2 Measurement
    Range 0 to 9999 ppm (NDIR)
    Resolution 1 ppm
    Accuracy ±40 ppm ±3% of measured value
    Response Time 120 seconds
    Warm-up Time 300 seconds
    Temperature Measurement
    Range -10 to +50°C
    Resolution 0.1°C
    Accuracy ±0.6°C
    Relative Humidity Measurement
    Range 0 to 100% RH, Non-condensing
    Resolution 0.1% RH, Non-condensing
    Accuracy ±5% RH, Non-condensing
    Dew Point
    Range Calculated using temperature and relative humidity
    Resolution 0.1°C
    CO Alarm Yes Yes
    CO2 Alarm Yes Yes
    Real Time Clock Yes
    Data Logger Yes, 450,000 Records
    Alarm Relay Output Form A×1, SPST. 30 VDC @ 16 A or 250 VAC @ 16 A
    Built-in Web Server Yes
    Wi-Fi Interface
    Antenna Antenna = 1 dBi (PCB Antenna)
    Output Power 18 dBm @ 1 DSSS, 14.5 dBm @ 54 OFDM
    Receive Sensitivity -95.7 dBm @ 1 DSSS, -74.0 dBm @ 54 OFDM
    Standard Supported IEEE 802.11 b/g/n
    Wireless Mode Infrastructure & Limited AP
    Encryption WEP, WPA and WPA2
    Transmission Range 50 meters (LOS)
    Powered from Terminal Block +12 to +48 VDC
    Powered from PoE IEEE 802.3af, Class 1 (48 V)
    Power Consumption PoE 1.8 W (Max.) 1.8 W (Max.) 1.9 W (Max.) 1.8 W (Max.)
    Non-PoE 1.7 W (Max.) 1.7 W (Max.) 1.8 W (Max.) 1.7 W (Max.)
    Dimensions (L x W x H) 114 mm x 106 mm x 56 mm
    Installation Desktop, DIN-Rail or Wall Mounting
    Operating Temperature 0 to +50°C
    Storage Temperature -30 to +75°C
    Humidity 10 to 90% RH, Non-condensing


    Large 2.8″ LCD Touch Screen, with clear Color Chart to indicate the CO/CO2 Level

    Simple and Powerful DL-300 Utility

    The DL300 Utility can be used to configure the modules, monitor real-time data, group DL-300 modules so that the status of distribution groups can be viewed and managed. The utility also allows the log data to be downloaded and exported to a .CSV file that can then be imported into any industrystandard software or spread sheet for analysis.

    Multi-platform Remote Access Software
    Real-time data from the DL-300 Data Logger can be accessed from anywhere and at any time using the DL300 Utility, the iOS or Android App, or via a regular web browser, as long as they are connected to the same local network as the Data Logger.


    Supports the MQTT Protocol for IoT Applications
    (Ethernet Interface Only)

    Real-time data from the DL-300-WF series can be accessed from anywhere and at any time using the WF-IIOT-Utility and iOS App.


    ▲ Android APP QR CODE
    Display Messages in Multiple Languages
    The display-message-on-screen function supports multiple language character sets based on UTF-8 encoding. Either pre-configured messages or dynamic messages can be remotely displayed using Modbus commands, or a dynamic message can be sent via the web-based interface.

    ▲ WiFi_IIOT_Utility

    Ordering Information

    DL-301-WF CR  Remote CO/Temperature/Humidity/Dew Point Data Logger with Ethernet/RS-485/Wi-Fi Interfaces and PoE (RoHS)
    DL-302-WF CR  Remote CO2/Temperature/Humidity/Dew Point Data Logger with Ethernet/RS-485/Wi-Fi Interfaces and PoE (RoHS)
    DL-303-WF CR  Remote CO/CO2/Temperature/Humidity/Dew Point Data Logger with Ethernet/RS-485/Wi-Fi Interfaces and PoE (RoHS)